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Journal of Environmental Quality Abstract - Plant and Environment Interactions

Does Calcite Encrustation in Chara Provide a Phosphorus Nutrient Sink?


This article in JEQ

  1. Vol. 35 No. 2, p. 490-494
    Received: July 17, 2005

    * Corresponding author(s): 03D5052@post.saitama-u.ac.jp
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  1. Kian Siong * and
  2. Takashi Asaeda
  1. Department of Environmental Science and Human Engineering, Saitama University, 255 Shimo-okubo, Sakura-Ku, Saitama 338-8570, Japan


We studied the effect of calcite encrustation in stoneworts (Chara spp.) on P cycling in an aquatic ecosystem. Sequential fractionation was performed to quantify P fractions of the internodes of calcified (Ca-CF) and uncalcified (UCa-CF) Chara fibrosa Agardh ex Bruzelius. Our results showed that Ca-CF was able to store more P and about 14 to 23% of total P in Ca-CF was co-precipitated with encrusted calcite, while only 2 to 3% was found in UCa-CF. Furthermore, in Ca-CF, an increased amount of total P did not result in a higher release of bioavailable water-soluble and sodium hydroxide–extractable P. Extracellular calcification in Chara enhanced nutrient sink for P, provided a further bottom-up control of phytoplankton, and should be regarded as a positive feedback in stabilizing Chara dominance in lakes.

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